User's Manual

Appendix A
SU-I-D Installation Manual 32 BreezeACCESS-MMDS Series
A.5 AMP 2440 Bi-Directional Amplifier
The AMP 2440 is a bi-directional amplifier designed for extending the range of
BreezeACCESS wireless LAN radios.
The unit operates automatically, therefore there is no need for manual
adjustments. The units receive signal gain and also provide transmit power
amplification.
Tx Power
Sense
In
DC
Power Supply
12 V DC
Rx
Tx
Tx Amp
Rx Amp
Bandpass
Filter
Tx
Out
RF
Rx
Figure A-5. AMP 2440 Functional Block Diagram
The amplifier is installed directly at the antenna’s feed point, providing
maximum effectiveness of transmit power which compensates for signal loss in
the transmitter cable to the antenna. Likewise, the Low Noise Amplifier (LNA)
in the AMP 2440 boosts the receive signal right at the antenna prior to
experiencing the loss in the transmission cable to the radio. This gain also
overcomes the losses in the transmission cable between the amplifier and the
radio. In fact, use of the AMP 2440 bi-directional amplifier will actually increase
the receiver sensitivity of the radio by 4dB. The ultimate result is the best
possible noise figure and maximum receiver sensitivity. System gains of up to 30
dB are typical when amplifiers are used at each end of a link.
The AMP 2440 bi-directional amplifier is completely weatherproof and can be
bolted to the antenna mast or tower leg using the U-bolt included. The connectors
face down so that gravity will drain all water away from the amplifier enclosure.
This will prevent water from settling on the face of the unit. Likewise, since the